Attachment for concentrating-tables.



No. 676,427. Patented'lune :8, I901.

w. G.D0DD.'

ATTACHMENT FOR comcsrammms TABLES.

(Application filed Aug. 30, 1900.) (No Model.)

- concentrates toward the discharge end thereline the concentrates are UNITED STATES -ATENT WlLLIS e. DODD, or sA'N raANo soo, CALIFORNIA.

ATTACHMENT FOR CONCENTRA'l'lNG-TABLES.

SIECIFIGATEONfOrming part of Letters Patent No. 676,427, dated June 18, 1901.

Application filed August 30,1900. Serial No. 28,492. cumin.)

- l vation of the mechanism disclosed by Fig.

of the drawings, and Fig. 4: is an end view in elevation of the attachment viewed from the feed end of the table. a

In the drawings the letter To all whom it may concern: 4

Be it known that I, \VILLIS G. DoDD, a citizen of the United States, residing in the ;city and county of San Francisco, in the State of California, have invented certain new and useful Improvements in Attachments for (Joncentrating-Tables; and I do hereby declare the following to be a full, clear, and exact description of the same.

Practical working of this class of machinery has proven that a certain proportion of the gold or valuable particles is carried off with what is known as middlings, and is thus lost or remains uuseparated unless reconveyed to the concentrating-table to be reworked. This is especially true in connection with the working of the ore by the use of what is known as the transverse rii'iied reciprocating table, or such as have a plain or unrifiied zone of flow at the extremity of the ritlied surface of the table. \Vith this class of tables the main separation takes place within the rifii'es of the table, while final separation of the valuable particles is made upon the plain or unriiiied portion of the A is used to inhaving a plain or unrifiied portion A. This unriftled portion constitutes the zone of flow of the material discharged from the riffled portion A of the table. To the side of the table, at the discharge-end portion B for the niiddling'sfis secured the attachment B. This attachmenthas the action of a miners horn and for such reason shall hereinafter be termed a horn attachment. Said horn attachment extends from approximately the extremity of the lowermost ritlle a to the discharge end of the table. Any suitable shape may be given thereto; but I prefer to gradually incline the outer wall or side thereof from ap roximately point end I). .The bottom of the horn is also slightly upwardly inclined from 11 toward its dis-- charge end I), which discharge end preferably terminates in a downwardly curved or inclined lip d, Fig. By thus constructing the side wall and incliniugthe bottom of the h'orn the material or middlings discharge therein may-be worked to much better advantage, as greater resistance is oltered to its outflow.

- he forward end of the horn B is pivotally secured or fulcruined to the bottom edge 1 of the table by bolt 6 which passes through eyerings e attached to the bottom of the horn. The discharge-end portion of the horn is supported by the adjustable bolt 4, which is fulcrumed between ears 5, depending from the horn, Figs. 3 and 4. This screw-bolt passes through plate 6, attached to bottom edge l of the table, and it is raised or lowered by adjusting-nuts 7. These supporting features of the discharge end of the horn maybe said to constitute an adjustable support or hanger, by means of which the inclination of the horn 1 may be varied, so as to regulate or adj 'ust the horizontal of the horn in accordance with the requirements of the material to be treated.

Any suitable style of mechanism may be employed for uniting the horn to the table and providing for such adjustment as may be required. I

table during the travel of the this portion of the ta subject to the action of clear water in order to wash the same and separate the sand or base or worthless portions therefrom. This current or fiow of water is suiiicient to carry the extreme fine floatgold with. the sand. This mixture of the sand and fine gold is termed middling's. It is the recovery of fine gold from this class of material to which the present invention relates.

The object of the invention is to provide a simple and inexpensive attachment for the table, by means of which the middlings'discharged may be reworked by the action of the table proper, the attachment being so arranged that it may be adjusted to meet the requirements of the material to be worked.

In order to comprehend the invention, reference should be had to the accompanying sheet of drawings.

Figure 1 is a top plan view of a concentrating-table, partly broken away, with the attachment applied thereto. Fig. .2 is an enlarged detail view of the attachment illustrated in Fig. 1. Fig. 3 is a side view in eleof. While passing over 1) toward its discharge dicate an ordinary rifiied concentrating-table too have shown and described the simplest form of means for such purpose; but, as stated, these may be varied as desired or practical worklng prove expedient.

dlings discharged from the zone of flow into This plate is utilized by reason of the fact that the horn is located a slight distance below the surface of the concentrating-table. 7

There is. .hingcd or fulcrumed to the face of the concentrating-table, near the lower dis-' charge corner of the zone of How, the deflecting finger or plate 9. This B is subjected to a homing action end b thereof, the worthless portionof the middlings being gradually worked over the opposite end thereof.

f the material to he collected from the middlings is heavy, then .the inclination of the horn may be slight, While if the recovered material proves to be exceedinglylight, then the-inclination of the horn is so adjusted as to con fine the material for a longer time therein.

in by Letters Patent, is 1. The combination with a reciprocating concentrating-table, of a horn attachment seconcentrating-table, of a horn attachment se-. cured thereto therefrom, Y

approximately the discharge end of the lowermost rifile of the table to the discharge end of said table, the discharge d of the horn inclined, and a into the horn attachment. 7 3. The combination With a reciprocating 7 7 concentrating-table, of a horn attachment sehorn attachment. 4. The combination with a reciprocating concentrating'table, of a horn attachment se- 

